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D( g )
(g-7)^3 = 0
(g-7)^3 = 0
(g-7)^3 = 0
g-7 = 0 // + 7
g = 7
g in (-oo:7) U (7:+oo)
((g-7)^9)/((g-7)^3) = 0
(g-7)^6 = 0
g-7 = 0 // + 7
g = 7
g in { 7}
g belongs to the empty set
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